[TRNSYS-users] How to control absorption chiller (Type 107)

Fri Aug 17 20:32:34 PDT 2018

Dear Jeff and Mario,

Thank you for your solution.

Best regards,

Sinchote

________________________________
From: Jeff Thornton <thornton at tess-inc.com>
Sent: 17 August 2018 12:06 AM
To: trnsys-users at lists.onebuilding.org
Subject: Re: [TRNSYS-users] How to control absorption chiller (Type 107)

Sinchote,

You need to use an Equation component in TRNSYS to multiply the two different requirements for the chiller.  The chiller wants a control signal of 1 (on) or 0 (off).  Multiplying the control signals for the aquastat with the output from the forcing function will only give a 1 if both the aquastat and the forcing function are both one.

Drag out an Equations component and create two inputs to the model.  Let's call them OK_Aquastat and OK_Timer.  Then create an equation which is OK_Chiller = OK_Aquastat * OK_Timer.  Connect the aquastat output to the input for OK_Aquastat and connect the forcing function output to the OK_Timer input.  Then connect the output equation OK_Chiller to the chiller control signal input.

Jeff

---
Jeff Thornton
President - TESS LLC
22 N. Carroll Street, Madison WI USA 53703
Office: (608) 274-2577  Fax: (608) 278-1475
www.tess-inc.com
E-Mail: thornton at tess-inc.com

On 08/16/2018 2:49 am, Sinchote Keeratianant via TRNSYS-users wrote:

Dear Jeff,

Thank you for your idea.

Did you mean the method as following below right ?

[cid:43bac3338a801e71e51335573e5beb4e at tess-inc.com]

How can i control 2 condition for absorption chiller working?

If you didn't mean as i said above could you help me how to resolve this problem.

Best regards,

Sinchote Keeratianant

________________________________
From: Jeff Thornton <thornton at tess-inc.com>
Sent: 16 August 2018 12:39 AM
To: TRNSYS users mailing list at OneBuilding.org
Subject: Re: [TRNSYS-users] How to control absorption chiller (Type 107)

The only thing I would add is that you might want to consider using an aquastat model instead of the simple "Greather Than" function for the tank temperature check.  The aquastat will have a deadband and will converge every time while the equation may oscillate between control states and cause non-convergence issues.

Jeff

---
Jeff Thornton
President - TESS LLC
22 N. Carroll Street, Madison WI USA 53703
Office: (608) 274-2577  Fax: (608) 278-1475
www.tess-inc.com
E-Mail: thornton at tess-inc.com

On 08/15/2018 11:06 am, Mario Humberto González via TRNSYS-users wrote:

Dear Sinchote,

The second condition can be controlled with the type 14h (Utility>Forcing Functions>General).

[X]

And define the schedule in the function editor like this

[X]

After that, in an equation, you can use a "greater than" to check if the tank temperature is above 75 °C. And finally an "and" to compare both conditions.

Best,
Mario

From: Sinchote Keeratianant <cole_sin at hotmail.com<mailto:cole_sin at hotmail.com>>
To: Angel Carrera <angel.carrera at aiguasol.coop<mailto:angel.carrera at aiguasol.coop>>, "TRNSYS users mailing list at OneBuilding.org" <trnsys-users at lists.onebuilding.org<mailto:trnsys-users at lists.onebuilding.org>>
Cc:
Bcc:
Date: Wed, 15 Aug 2018 08:22:27 +0000
Subject: Re: [TRNSYS-users] How to control absorption chiller (Type 107)

Dear Angel,

Do you mean combine 2 conditions into equation block and then use these result to control absorption chiller (type 107) right?

If yes. Could you tell me how can i combine both into equation block?

I'm looking forward to hearing from your answer.

Thanks.

Best regards,
Sinchote

________________________________
From: Angel Carrera <angel.carrera at aiguasol.coop<mailto:angel.carrera at aiguasol.coop>>
Sent: 14 August 2018 7:52 PM
To: TRNSYS users mailing list at OneBuilding.org
Subject: Re: [TRNSYS-users] How to control absorption chiller (Type 107)

Dear Sinchote,

You can implement that control by multiplying both of your conditions in an equation block, and use the result as your control signal. The first of your conditions will work better if you implement it in a type 2 and the second can came from some forcing function, hope it helps

Angel

El mar., 14 ago. 2018 10:47, Sinchote Keeratianant via TRNSYS-users <trnsys-users at lists.onebuilding.org<mailto:trnsys-users at lists.onebuilding.org>> escribió:

Dear Trnsys users,

      I'm studying in master degree and conducting the simulation solar cooling system. I have a problem about how to control the absorption chiller model(type 107) working.

I would like to control 2 modes for absorption chiller working :
1. Absorption chiller working when temperature in hot water tank reach to 75 degree celsius and
2. Absorption chiller working on 9.00 a.m. - 22.00 p.m.

The absorption chiller wiil work when both of conditions happen.

Has anyone experienced this problem and knows how to fix it?

Best regards,

Sinchote

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--
Mario González
Estudiante de Maestría en Ciencia y Tecnología Ambiental
Centro de Investigación en Materiales Avanzados, S.C.

Calle CIMAV 110
Ejido Arroyo Seco
34147 Durango Dgo
googlemaps: 23.991642, -104.726418<https://www.google.com.mx/maps/place/CIMAV+Unidad+Durango/@23.9832284,-104.7235413,15z/data=!4m5!3m4!1s0x869bc621a15c53fb:0x807a36fc6594487d!8m2!3d23.9913253!4d-104.7261762>
www.cimav.edu.mx<http://www.cimav.edu.mx/>

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